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Part 13: dplyr, says "we're going to cover 6 of the most commonly used functions..." and then only lists 5 functions. Either arrange should be added as the 6th, or the sentence should be edited to say 5 functions. I can make a PR, but I don't know whether arrange was intentionally excluded, or if this is just an omission.

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Thanks for catching that, and sorry for the delayed response. Seems like a typo. I think the easiest for now would be change 6 to 5. arrange() is handy, but not always used like most of the others, so perhaps we could get away without having it in there now. A PR to fix that would be welcome.

I think if anything, these lessons often err on the side of too much content, and could use more focus, so no reason to add more in here.